Morphological features of the structure of fibres prepared from solutions of cellulose in methylmorpholine oxide

Romanov, V. V.; Sokira, A. N.; Lunina, O. B.; Iovleva, M. M.

doi:10.1007/bf00544759

Cited by 10 publications

(11 citation statements)

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“…Romanov et al (1988) noted that the regeneration of fibres in a bath of isopropyl alcohol increases their microporosity (0.1 lm) and creates vacuoles in the structure in comparison with a water bath. Fink et al (2001) reported that fibres precipitated in water show a dense cellulose network structure with small finely distributed voids with dimensions ranging from 10 to 100 nm.…”

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confidence: 98%

“…As far as the regeneration of cellulose-NMMOwater solutions is concerned, several publications describing the morphological features of fibres and films are available (Romanov et al 1988;Bang et al 1999;Fink et al 2001;Laity et al 2002). Romanov et al (1988) noted that the regeneration of fibres in a bath of isopropyl alcohol increases their microporosity (0.1 lm) and creates vacuoles in the structure in comparison with a water bath.…”

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confidence: 99%

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Morphology of cellulose objects regenerated from cellulose–N-methylmorpholine N-oxide–water solutions

Biganska

Navard

2008

Cellulose

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The precipitation in aqueous media of cellulose from solutions in N-methylmorpholine Noxide (NMMO) hydrates is an important stage in the process of manufacturing of fibres, films and other cellulose objects. It is responsible for the formation of the structure of the regenerated object and their morphological characteristics significantly influence the properties of the final products. Regeneration of rather large cellulose objects was observed in situ by optical microscopy. It was found that all regenerated objects present an asymmetric structure composed of a dense skin surrounding a sub-layer characterised by the presence of finger-like voids. The porous texture of the cellulose parts between these voids is typical of the one obtained by spinodal decomposition. The morphologies of regenerated cellulose samples are described as a function of various parameters, initial cellulose solutions and composition and temperature of the aqueous regeneration bath. A mechanism of the structure formation during regeneration is proposed.

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confidence: 98%

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confidence: 99%

Morphology of cellulose objects regenerated from cellulose–N-methylmorpholine N-oxide–water solutions

Biganska

Navard

2008

Cellulose

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“…Another way to control the kinetics of coagulation in the spinning process from cellulose solutions in NMMO is the use of aliphatic alcohols [22][23][24][25], which are more or less compatible with aqueous NMMO solutions and therefore can be used in the spinning process. It is shown in [22] that, in the case of coagulation of the solution with ethanol, a decrease in the degree of orientation of cellulose macromolecules is observed, which entails a decrease in the elastic modulus and stiffness of the fibers.…”

Section: Introductionmentioning

confidence: 99%

“…The authors stated that, at coagulation temperature of 20 • C, IPA molecules have a lower affinity for the solvent compared to water. An increase in the IPA temperature (up to 35 • C) and, accordingly, the rate of coagulation leads to the formation of a porous structure with an average pore size of 100 nm and even to the formation of large vacuoles in the fibers [24,25]. When spinning proceeds in IPA of different temperatures, the strength of the fibers falls by almost 2.5 times when the temperature increases from 15 to 50 • C, and the values of elongation at break have a maximum at 20 • C.…”

Section: Introductionmentioning

confidence: 99%

A Role of Coagulant in Structure Formation of Fibers and Films Spun from Cellulose Solutions

et al. 2020

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Replacing the aqueous coagulation bath with an alcoholic one during spinning cellulose fibers (films) from solutions in N-methylmorpholine-N-oxide leads to a radical restructuring of the hydrogen bonds net of cellulose and, as a result, to a change in the structure and properties of the resulting material. By the method of optical interferometry, it was possible to identify the intrinsic features of the interaction of the solvent and isomeric alcohols and to construct phase diagrams of binary systems describing the crystalline equilibrium. Knowledge of the phase states of the system at different temperatures renders it possible to exclude the process of solvent crystallization and conduct the spinning in pseudo-homogeneous conditions. The structure and morphology of samples were studied using X-ray diffraction and scanning electron microscopy methods for a specific coagulant. When the solution under certain conditions is coagulated at contact with alcohol, the solvent may be in a glassy state, whereas, when at coagulation in water, an amorphous-crystalline structure is formed. The structural features of cellulose films obtained by coagulation of solutions with water and alcohols help to select potential engineering or functional materials (textile, packaging, membranes, etc.), in which their qualities will manifest to the best extent.

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“…This is probably due to certain disadvantages inherent in the preparation of cellulose blends with polymers: For example, cellulose cannot melt and no convenient organic solvent has been available until recently. In recent years, a variety of solvents for cellulose have been described 1–20…”

Section: Introductionmentioning

confidence: 99%

Properties of cellulose/PAN blend membrane

Pang

2002

J of Applied Polymer Sci

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Morphological features of the structure of fibres prepared from solutions of cellulose in methylmorpholine oxide

Cited by 10 publications

References 1 publication

Morphology of cellulose objects regenerated from cellulose–N-methylmorpholine N-oxide–water solutions

Morphology of cellulose objects regenerated from cellulose–N-methylmorpholine N-oxide–water solutions

A Role of Coagulant in Structure Formation of Fibers and Films Spun from Cellulose Solutions

Properties of cellulose/PAN blend membrane

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